18684133 has 6 divisors (see below), whose sum is σ = 20232114. Its totient is φ = 17246736.

The previous prime is 18684121. The next prime is 18684161. The reversal of 18684133 is 33148681.

It can be written as a sum of positive squares in 3 ways, for example, as 1361889 + 17322244 = 1167^2 + 4162^2 .

It is not a de Polignac number, because 18684133 - 2⁵ = 18684101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18684433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55110 + ... + 55447.

It is an arithmetic number, because the mean of its divisors is an integer number (3372019).

Almost surely, 2^18684133 is an apocalyptic number.

18684133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18684133 is a deficient number, since it is larger than the sum of its proper divisors (1547981).

18684133 is a wasteful number, since it uses less digits than its factorization.

18684133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110583 (or 110570 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 18684133 is about 4322.5146616293. The cubic root of 18684133 is about 265.3531922812.

The spelling of 18684133 in words is "eighteen million, six hundred eighty-four thousand, one hundred thirty-three".